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Union Pacific 3985 is a four-cylinder simple articulated 4-6-6-4 "Challenger"-type steam locomotive built in July 1943 by the American Locomotive Company (ALCO) of Schenectady, New York, for the Union Pacific Railroad. No. 3985 is one of only two Challengers still in existence and the only one to have operated in excursion service.
Union Pacific Challenger No. 3985 is an example of a 4-6-6-4 locomotive. In the Whyte notation for classifying steam locomotives by wheel arrangement, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by two sets of six coupled driving wheels and four trailing wheels. 4-6-6-4's are commonly known as Challengers.
The Union Pacific Challengers are a type of simple articulated 4-6-6-4 steam locomotive built by American Locomotive Company (ALCO) from 1936 to 1944 and operated by the Union Pacific Railroad until the late 1950s. A total of 105 Challengers were built in five classes. They were nearly 122 ft (37 m) long and weighed 537 short tons (487 tonnes).
Union Pacific No. 119; Union Pacific 618; Union Pacific 737; Union Pacific 844; Union Pacific 1243; Union Pacific 1982; Union Pacific heritage fleet; Oregon Railroad and Navigation 197; Union Pacific 3985; Union Pacific Big Boy; Union Pacific 4012; Union Pacific 4014; Union Pacific 4023; Union Pacific 4141; Union Pacific 4466; Union Pacific ...
UP 3985: a 4-6-6-4 "Challenger" class dual-service steam locomotive, operated in excursion service from 1981 to 2010 and was retired as of January 2020. Delivered in 1943, it operated in revenue service until it was withdrawn from service in 1962.
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The American Locomotive Company (often shortened to ALCO, ALCo or Alco) was an American manufacturer that operated from 1901 to 1969, initially specializing in the production of locomotives but later diversifying and fabricating at various times diesel generators, automobiles, steel, tanks, munitions, oil-production equipment, as well as heat exchangers for nuclear power plants.